Anyone feed fish Costco Nori?

[Delphinus]

Is there something about Costco brand that is of a concern?

I feed my tangs nori all the time. Not specifically Costco nori, however, just whatever I get from whatever grocery store I'm at, whenever I feel like buying some. For what it's worth, I just have never gotten nori at Costco, so technically my answer is otherwise "no, not Costco" but otherwise I'd have had no concerns and would certainly get it if I happened to think about it the next time I am at Costco...